The trial production link is the most critical link in the entire Yu's Seven Towers project. Through the trial production link, the production efficiency data, quality data, performance parameters, and the most critical actual output data of the product are obtained. In addition, there are still inspection margins.
Is the seven-tower unit running stably and reliably? There are loopholes in some manufacturing links.
If the actual output of Yu's Seven Towers cannot meet the design standards and there are errors in the operation of trial production, it will mean rework and delay the manufacturing schedule.
However, the only good thing is that for the environment of the era of 1937, there was no need to consider issues such as high energy consumption, high pollution, and environmental protection. As for the materials and documents that countless corporate project personnel in later generations were worried about, it was even more
does not exist.
In the trial production process of Yu's seven-tower prototype device, the core performance indicator is the actual output.
The designed output is 22 tons in 24 hours, and the output per hour is 0.916 tons. The actual output reaches more than 95%, which can pass the production standards set by Yu Hua.
In the experimental site, Lin Wan, as the deputy team leader, is leading team members such as Fang Yu and Zhou Yuan, as well as a team of welders to conduct a final safety inspection to check whether there are gaps in the welds connecting the pipelines, their firmness, and the lines and centrifugal pumps.
etc.
This is the last safety inspection before trial production and must be carried out extremely carefully.
Lin Wan and others braved the scorching sun, climbing up and down, carefully checking the pipelines between the core containers of the Seven Towers of the Yu Family. After checking the last core container, Lin Wan, who was completely soaked with sweat, stood.
On the metal scaffolding, he raised his right hand high like a braised pig's trotter, giving a thumbs up to Yu Hua.
This means passing the inspection.
After more than half a month, Lin Wan's skin darkened at a speed visible to the naked eye, and the skin even peeled off her shoulders.
Immediately afterwards, team members Fang Yu and Zhou Yuan all gave a thumbs up, indicating that the inspection passed.
At this moment, Xiong Shenggang and the nine welders, who saw the actions of the three people, finally breathed a sigh of relief and relaxed slightly.
For them, this safety inspection before trial production is nothing more than a 'graduation exam'. Fortunately, everyone passed this graduation exam.
However, now is not the time to celebrate happily.
As the core members of the design team passed the inspection, the workers surrounding the experimental site, including Liu Wei and the elegant man, all understood that the most critical moment had come.
"Each team is ready to enter the trial production phase." Yu Hua stared at the Yu's Seven Towers prototype device that had passed the last safety inspection in the experimental site, took a deep breath, and issued instructions as the team leader.
The big thing in front of him is the second work that condenses his countless efforts.
Whether we can succeed or not depends on today!
I have been working hard to forge a sword for a month, now I will test my edge.
If this 'sword' is sharp, it can cut out the future of the China Chemical Industry Building and fill in the gaps left by the China Chemical Industry.
Following the order from the top leader of the project, several production teams that had been trained to a qualified level quickly entered the experimental site and went to their respective posts. Although these warrior production team members had no academic qualifications and were not literate, they won. With a flexible mind and strong execution ability, he can complete the "parts" responsibilities well.
As long as each 'part' can operate normally and play its role, then Yu's Seven Pagodas can operate normally.
Soon, all production teams were on duty.
"Seat No. 1 is ready!"
"Seat number two is ready!"
"Position three is ready!"
One message after another was sent back to Yu Hua through the dispatcher at the experimental site. A few minutes later, all the production teams at the production station were ready.
At this moment, everyone is paying attention.
Everyone present held their breaths, and the elegant man was concentrating on it. With a pair of star-like eyes, he stared at the Yu's Seven Towers, which was completely beyond his imagination and full of industrial beauty. He clenched his right hand slightly, and there was a trace of worry in his heart.
Liu Wei didn't say a word, he was breathing slightly, his heartbeat was a little faster, and his focus was entirely on the experimental site. After working in the revolutionary cause for so many years, he had never been so nervous and expectant as he was today.
At this time, everyone was silent.
"Connect the power to the unit, feed the boiling furnace and ignite it." Yu Hua gave instructions in an orderly manner to the dispatcher holding a flag.
The dispatcher immediately waved the two flags in his hand and conveyed instructions to the production teams staying in different areas and locations of each device. Immediately afterwards, Yu's seven-tower unit was powered on, and the fans installed at the bottom of the two boiling furnaces entered working status and rotated at high speed. The air is extracted into the boiling furnace, sprayed out at high speed through the small holes in the refractory base layer at the bottom of the furnace, and impacts the quartz sand from top to bottom.
At the same time, the feed port opened the closed warehouse door, and countless light yellow solid sulfur particles as big as rice grains poured into the boiling furnace like water flow, rising and flying under the action of high-speed airflows, doing Brownian motion. , then, the furnace lance is ignited, and the sulfur particles fully combined with oxygen burst into flames, burning violently under the influence of oxygen, emitting a beautiful blue flame.
This is a fluidized bed boiling furnace design born in the 1950s. It has low technical content. It consists of a furnace, a refractory base layer, and a fan. Its advantages are full combustion, easy control, simple production and manufacturing, and it takes into account both sulfur combustion and iron sulfide powder gas production. The disadvantage is that quartz sand causes serious wear and tear on equipment, has high smoke and dust content, and causes high pollution.
However, there is no need to worry about the shortcomings of smoke pollution.
In the fluidized bed boiling furnace with a radius of 1.5 meters and a height of 3 meters, countless violently burning sulfur solid particles and quartz sand are constantly rolling and boiling like boiling water. The high-purity sulfur produced after the sulfur is burned combines with oxygen to form a high-temperature state. The sulfur dioxide passes through the metal pipe connected to the cold water. After cooling, the temperature drops to about 450 degrees Celsius, and flows towards the first core container and the second core container.
With the continuous supply of high-temperature sulfur dioxide gas, the acid-forming tower and the denitrification tower entered working state one after another, and the large centrifugal pump started to rotate and pressurized the gas.
In the experimental site, white steam slowly emerged, and the sound of the fan running and the sound of the large centrifugal pump complemented each other, playing a symphony unique to the chemical industry.
The high-temperature gas treated in the acid-forming tower and the denitrification tower passes through the metal pipeline and flows into the No. 2 acid-forming tower again. The sulfur dioxide generates nitrate-containing sulfur trioxide under the oxidation. These nitrate-containing sulfur trioxides at a pressure slightly higher than atmospheric pressure and high temperature
The sulfur gases continue to flow to the next core container. They have to undergo decontamination and oxidation treatment to remove the nitrogen oxides and nitrates contained in them, forming dilute sulfuric acid with a mass fraction of 76%, which is then sprayed with concentrated sulfuric acid to increase the concentration.
.
In the concentrated sulfuric acid spray treatment process, except for the first portion of the original concentrated sulfuric acid, the remaining concentrated sulfuric acid is supplied from the internal circulation.
The prerequisite for producing sulfuric acid is that you must first have concentrated sulfuric acid.
Chemical reaction formulas appear simple and concise on paper, but in the actual production process, they appear extremely complex.
As time passed, everyone became more and more nervous. Lin Wan, Fang Yu and Zhou Yuan held their breath, not daring to take a breath. Only Yu Hua had a calm face, bright and natural eyes, and did not show any signs of panic.
Perhaps because he felt Yu Hua's calmness and composure, even though the people around him were anxious and nervous, they still held firm and did not lose their balance.
Ten minutes later, pure, colorless, oil-like finished sulfuric acid finally flowed out from the metal pipe opening connected to the steel sulfuric acid storage tank at the end of the Yu's Seven Towers device.
"Yes, sulfuric acid is coming out!" In an instant, the two members of the production team in charge here immediately became excited and hurriedly reported the situation to the dispatcher not far away.
As soon as the news came out, it swept through everyone in the experimental site like a bombshell. After a short period of calm, the entire Liucun Experimental Site was boiling. Workers involved in the construction of the project cheered and were excited, and some even flashed.
Symbolizing tears of hope.
For them, highly corrosive pure sulfuric acid is the real hope.
"Huh..." Lin Wan and Fang Yu, who were nervous inside, breathed a sigh of relief.
The elegant man and Liu Wei also showed expressions of joy and excitement. Their eyes were filled with joy as they stared at the thick light yellow exhaust gas being discharged into the blue sky.
"Collect samples."
Yu Hua's face remained calm, and he didn't care about the excitement of the people around him, and said seriously.
In an instant, the dispatcher conveyed the order. The production team located at the metal pipe mouth at the end of the production device immediately executed the order. One person immediately opened the metal valve on the main pipeline in accordance with the pre-existing procedures. One person wearing protective gloves held a five-capacity pipe in his right hand.
100 ml glass beaker to collect samples.
The sample needs to be divided three times, with an interval of more than one minute each time, and the total quantity is 1.5 liters. The detection method is chemical detection, using a phenolphthalein indicator to conduct a standard alkali solution neutralization titration experiment.
Three minutes later, the sample collection was completed and delivered by a member of the production team in person, and placed on the podium where various chemical instruments were arranged.
As the team leader, Yu Hua conducted the first sample quality inspection under the spotlight. The three Linwa people stayed nearby and carefully watched Yu Hua's operating steps and techniques. The others stared nervously at the podium.
Let Yu Hua conduct an extremely critical test.
The final result of the test is crucial, and this waiting process is tantamount to the moment of giving birth to the workers around.
"The quality scores are all 98%, and the quality is qualified."
After completing the standard alkali solution neutralization titration experiment, Yu Hua calculated based on the experimental weights and parameters given by the three bottles of samples, and finally obtained the mass fraction data of the three bottles of samples. He nodded and announced the test results.
After the quality inspection passed, everyone breathed a sigh of relief again and showed joy again.
This is the second good news.
"Comrade Yu, what are we going to do next?" At this time, the elegant man came up and asked Yu Hua.
"wait."
Yu Hua greeted Lin Wan and signaled to record the data, then turned around with a look of respect on his face and explained carefully: "Now the mass fraction of the finished sulfuric acid has been obtained. After 24 hours, we only need to obtain the flow rate
By measuring the sulfuric acid flow rate data, the actual production parameters can be obtained. If the first experimental trial production reaches more than 95%, that is, 20.9 tons per day, it is considered qualified."
Lin Wan nodded and quickly took charge of recording the quality score data.
"Is thirty tons of sulfur enough?" The elegant man nodded after hearing this. He had an idea in his mind and continued to ask.
"Enough, the molecular weight of sulfur is 32. One ton of sulfur can produce three tons of sulfuric acid. In theory, thirty tons of sulfur can produce ninety tons of sulfuric acid." Yu Hua nodded and smiled. One ton of sulfur, three tons of acid, this is the standard.
"Ninety tons of sulfuric acid?! According to the current sulfuric acid price of 300 silver dollars per ton on the market, doesn't it mean that the sulfuric acid produced from this sulfur is equivalent to 27,000 silver dollars!" The elegant man was startled when he heard this data, and his mind immediately reacted,
Somewhat incredible.
Since sulfuric acid is one of the strategic resources and is highly regulated by the government, sulfuric acid and other chemicals on the market in Beiping are now very scarce and in short supply. The price of 80% concentration sulfuric acid products has reached about 180 silver dollars per ton, while 98%
High-concentration sulfuric acid can reach 300 silver dollars. The key is that it has a price but no market.
The value of 90 tons of sulfuric acid is as high as 27,000 silver dollars.
How much does it cost?
Thirty tons of sulfur cobbled together here and there are not easy to buy, but the price is only about 50 oceans per ton, and the gap between cost and total value is six times.
Darling, the Yu's Seven Pagodas in front of you are not producing sulfuric acid, but producing 'money'!
As soon as the machine is turned on, money flows out like water.
Yu Hua smiled: "Yes, in theory, once thirty tons of sulfur are produced and sold, the total value of the sulfuric acid can recover all the R&D investment in the Yu's Seven Towers project."
"27,000 silver dollars... It's really unimaginable." The elegant man was shocked. He turned to look at Yu's Seven Pagodas and once again felt the extraordinary charm and terrifying productivity brought by science.
fear.
Really scary.
Is this the charm of science and technology?
The total investment in technology research and development was 15,000 silver dollars, and the total value of the trial production of 90 tons of sulfuric acid was 27,000 silver dollars. This was an incredible return even he heard. If the news spread, it would be enough to drive capitalists across the country crazy.
If nothing goes wrong, the sulfuric acid products produced by Yu's Seven Pagodas will become one of the important economic sources for the base area. According to the initial planned annual output of 24,000 tons, the annual economic benefit will be as high as 7.2 million silver dollars, not counting the outbreak of war.
There is a high probability of price increases in the future.
If the price of sulfuric acid increases by 50 silver dollars per ton, the annual economic benefit will increase by 1.2 million silver dollars.
The importance of money is self-evident.
And all of this was brought about by Yu Hua.
The first experiment continued. Next, Yu Hua ordered to enter full-load production mode, and Yu's Seven Towers entered the maximum industrial production state. The pre-processed industrial sulfur continuously entered the silo under the action of the conveyor belt, and the valuable high-purity concentration
The sulfuric acid flows out from the end of the device and is stored in the tank.
A storage tank with a volume of 50 cubic meters can store up to 92 tons of sulfuric acid, which just meets production needs.
The sky is getting dark and turning into night. The prototype of Yu's Seven Towers has been in stable production for more than 3 hours. The current flow rate per hour is about 0.87 tons, and the designed flow rate per hour is 0.916 tons. The ratio of actual output to design indicators has reached 94.9%, which is in line with
First trial production requirements.
However, it is not yet time to draw a conclusion.
The actual output needs to meet the standard, and the unit operation needs to be stable and reliable.
Late at night, each production team stood ready and stood firm. They deeply understood how important their work was, and they all tried their best without any cheating.
Yu Hua and all members of the design team also stayed at the experimental site and did not leave even half a step.
Industrial waste gas, which symbolizes high pollution, pours into the night sky, polluting the surrounding environment. Industrial wastewater enters the reservoir along with Baiyangdian, polluting the water quality and poisoning fish and shrimp. High-purity sulfuric acid, which symbolizes money and hope, continues to flow into the lake.
Storage tank.
This is the best of times and the worst of times.
On the 12th hour of the first experimental trial production, at 4 a.m., Yu's seven-tower prototype ran at full load for 11 hours. The condition was reliable, and all pressure gauges and parameters were normal. Each production team was familiar with the entire production model, and their proficiency improved.
This increases production efficiency. The current flow rate per hour is about 0.89 tons, and the actual production rate rises to 97.1%, exceeding the indicator line.
On the 19th day of the Yu's Seven Towers research and development project, the first experimental trial production process is halfway through.
"Huh..." Lin Wan held the notebook in her left hand and recorded the hourly traffic data in detail with her right hand. After finishing her work, she swayed slightly and felt dizzy, so she quickly supported the table with her hands.
"Are you okay? Jin Yu." Seeing this, Yu Hua took a step forward and asked.
"It's okay, I'm just a little dizzy and my eyelids are fighting." Lin Wan shook her head and said softly with a tired tone.
Not only Lin Wan was tired, but also Fang Yu and Zhou Yuan, members of the design team, all looked tired.
"It's been twenty-three hours since five o'clock yesterday morning. Why don't you go get some sleep first and I'll call you later." Yu Hua said softly.
"No, I can still hold on. This is the most important moment for Yu's Seven Pagodas. I can't sleep." Lin Wan shook her head and said.
Fang Yu and Zhou Yuan nodded in succession.
"Okay, there are still twelve hours left. We have already seen the dawn of victory. Come on." Sensing the attitude of the three people, Yu Hua stopped trying to dissuade him and encouraged him.
Whether from a physical or psychological perspective, everyone has reached their limit and is on the verge of collapse.
For so many days, everyone barely had a good night's sleep. They basically only slept for four or five hours before starting a new round of work. Fang Yu even had a menstrual period on the way, and endured the discomfort in the experimental site.
Running around, even if Yu Hua dissuades him, it is useless.
And all this is just for success.
Twelve hours left, victory is already in front of us.
"Come on." The three of them looked at each other with determination in their eyes and nodded in unison.
…
Time keeps passing like quicksand, one hour after another, and in a blink of an eye, at 3:30 pm on the nineteenth day, twenty-three hours and thirty minutes have passed since the start of trial production, and there are still only thirty minutes left before the actual daily production data is collected.
minute.
The afternoon sun is so hot and poisonous that it seems to be roasting people to death.
In the experimental site, all project participants were present. The elegant man and Liu Wei stood on the podium, with pairs of eyes containing different colors, all placed on the Yu's seven-tower prototype machine that was steadily producing sulfuric acid.
As the team leader, Yu Hua stood at the front, with three members of the design team behind him.
"Collect flow parameters." As the minute hand of the watch accurately returned to zero and the hour hand pointed to four o'clock, Yu Hua's mind remained clear. The golden mathematical symbols released a cold meaning to relieve brain fatigue. He took a deep breath and issued a new command.
The dispatcher immediately waved the flag and conveyed the order, and the production team at the other end immediately executed it, collected a new round of flow meter data, and sent it to the command podium.
This is the last traffic data, recording the traffic data for the 24th hour.
Yu Hua took over the newly collected data, then added the hourly flow data of the past twenty-three hours for calculation, and obtained the twenty-four-hour sulfuric acid production and production trend, and then made it into a simple data visualization
sketch.
Data visualization sketches allow people to understand the entire data information more intuitively.
In the field, it is quiet.
Everyone waited silently, feeling extremely nervous and not daring to breathe.
Qualified or unqualified?
Three minutes later, Yu Hua picked up a piece of paper recording the 24-hour sulfuric acid production data, turned around, and faced everyone.
"The first experimental trial production data of Yu's seven-tower prototype machine are as follows: the actual output of sulfuric acid in 24 hours: 21.12 tons, the output per hour is 0.88 tons, the ratio to the design output is 96%, and it meets the requirements of the trial production indicators."
"Comrades, we succeeded!"
With his words full of solemnity, Yu Hua announced the final results of the trial production and the actual output to everyone on site.
Trial production passed and actual output qualified.
boom!
In an instant, the entire experimental site fell into a commotion after a brief period of calm. Everyone was extremely excited, and the emotions that had been stored in their hearts for a long time seemed to burst out like a dam. They did it.
"Okay, okay, great!"
The elegant man standing at the front raised his hands, applauded quickly, and applauded Yu Hua who was standing in front of the podium. He said several good things one after another: "This is a victory. A victory in the technical field is no less important.
To annihilate one enemy division, no, it should be an army!"
Success!
It took nineteen days, the culmination of Yu Hua's hard work and more than 200 people's sweat - the Yu's Seven Towers project was officially declared a success.
With Yu's Seven Towers technology, the base areas with weak economic foundation and backward development level will be injected with a shot in the arm.
In terms of economic benefits alone, the sulfuric acid industry based on Yu's Seven Towers technology can generate millions or even tens of millions of silver dollars in revenue every year, not to mention the important role of sulfuric acid in the military industry and steel smelting fields.
When they heard the final results announced by Yu Hua, Lin Wan and the other two people, who had been holding on for more than thirty hours, all showed comfortable smiles on their faces and applauded warmly.
The applause was as warm as the tide, and everyone gave heartfelt applause to the experimental results and Yu Hua, the founder of Yu's Seven Pagodas.
Yu Hua smiled and accepted the applause from these pioneers calmly. He was qualified to accept this applause because he was the one who brought the new seven-tower device that only appeared in the 1950s to the Marco Polo Bridge in 1937.
On the eve of the incident.
Be calm and accept it!
"Bang!" Not far away, the entourage of the elegant man raised the camera in his hand, found the right angle, and pressed the shutter.
The picture is frozen. In the black and white photo, the blue sky and the experimental field are used as the background. Yu Hua is standing on the podium with a smile on his face. In front of him are the elegant men, Liu Wei, members of the design team and the project who are applauding warmly.